(As I mentioned, I am reviewing a couple of online tools to track the popularity of ideas over time. Please forgive this segway away from voting reform issues.)
Icerocket’s blog trends tool is a service to track the popularity of search terms over time based on how many blogs mentioned them recently. Their instructions are simple:
Enter item(s) to see mentions trended over time. Enter up to three queries under Trend Term(s). Type in the label you would like associated with each query under Display Label(s).
All About Voting 